convertgdalorthophotoraster
I would like to convert more than 300 orthophotos produced at scale 1:8.000 with a pixel size of 0.8m X 0.8m from Ecw format to Tiff format and after resampling pixel values.
My aim is to batch convert the input format (Ecw) to output format (Tiff) and after to resample the pixel size (values) 10mX10m.
How could I right this script using gdal to batch process this raster files.
I'm using FWTools on Windows XP
Thanks
You can look at Python Image Library. There are lots of function for image processing.
With pil you can control Brightness, Contrast... for gamma read Gamma Correction and this... and you can look for image manipulation image.py
After finding the geopdf files, I get the same error message with GDAL 1.11.0 that was shipped with QGIS Chugiak, although gdalinfo --formats lists the pdf driver as rw.
But it works with GDAL 1.11.1 shipped with QGIS Brighton, current OSGeo4W and the binaries from gisinternals.
See also How to add Georeferenced PDF as layer to QGIS 2.0? for some bug tickets that may have been solved lately, especially http://hub.qgis.org/issues/8912 for handling of USGS Topo pdfs.
By the way, you can now use ogr2ogr -f sqlite out.sqlite in.pdf to store the vector layers from the pdf into a sqlite database and display that in QGIS:
This looks far better in detail than the rasterized output of gdalwarp (and saves lot of disk space too).
Best Answer
You might want to consider using gdalwarp instead of gdal_translate as it gives you the ability to control the output pixel size more precisely.
eg.
You can also specify a variety of resampling kernels. For such radical downsizing averaging might be appropriate.
eg.